Bicycle frame



FIG. 1 is a perspective view of a bicycle frame;

FIG. 2 is a left side view of the bicycle frame;

FIG. 3 is a right side view of the bicycle frame;

FIG. 4 is a rear view of the bicycle frame;

FIG. 5 is a front view of the bicycle frame;

FIG. 6 is a top view of the bicycle frame; and,

FIG. 7 is a bottom view of the bicycle frame.

The ornamental design for the bicycle frame, as shown and described.